This paper deals with the study of nanocrystalline TiO₂:WO₃-based hydrogen sensors. Using conventional techniques like XRD, SEM and TG-DTA performed structural characteristics. XRD of undoped TiO₂ calcined at 600°C for 6 h shows good crystalline quality having a 54 nm grain size. The sensitivity was improved by adding 15 wt% WO₃.TiO₂ based H₂ gas sensor. The operating temperatures of the sensors were optimized under different operating conditions. TiO₂ sensor doped with 15-wt % WO₃ and 0.5 wt % Pt showed the maximum response to H₂ with a higher selectivity at an operating temperature of 200°C. The electronic interaction between the additive and the oxide semiconductor is proposed to account for the sensitization effects.